<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <form>
      <input type="file" name="avatar" accept="image/*" placeholder="请选择头像" />
      <button>上传文件</button>
    </form>
    <img src="" alt="" class="avatar" style="width: 500px" />
  </body>
  <script src="./axios.js"></script>
  <script>
    
const form = document.querySelector('form');
const img = document.querySelector('.avatar');
form.addEventListener('submit', function(e){
e.preventDefault()
const data = new FormData(this)
axios({
url:'http://ajax-api.itheima.net/api/file',
method:'POST',
data
})
.then(({data:res}) => {
  img.src = res.data.url
})
})
  </script>
</html>
